| 摘要 |
The filter (1) includes a piezoelectric substrate (2) with a flat surface (3) presenting a number of electrodes of two type (4,5). Each electrode is a straight line deposited on the surface normal to an axis (X). Each pair of electrodes and the space delimited by them define a transducer. These transducers are divided into two groups (7,8). The transducer electrodes are connected to conducting paths (13,15,17) which are linked to three terminals (14,16,18). One of the terminals (16) is earthed, while the other two are used for signal input and output. |
